Rock Identifier

Category

Igneous Rock (Volcanic Glass)

Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.

Learn about Igneous Rock (Volcanic Glass) in the encyclopedia

Rock Gypsum

Coral Rock

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Black Obsidian

Obsidian

Pink Obsidian

Sideromelane

Carbonatite

Tachylite

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Basalt with weathering/lichens (Extrusive Igneous Rock) — igneous

Basalt with weathering/lichens

Extrusive Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Peridot in Basalt (Olivine ((Mg, Fe)2SiO4) in Basalt) — mineral

Peridot in Basalt

Olivine ((Mg, Fe)2SiO4) in Basalt

Weathered basaltic rock (probable basalt or scoria) (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or volcanic glass) — igneous

Weathered basaltic rock (probable basalt or scoria)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or volcanic glass

Scoria (Red Lava Rock) (Scoria (Aphanitic-Vesicular Mafic Rock)) — igneous

Scoria (Red Lava Rock)

Scoria (Aphanitic-Vesicular Mafic Rock)

Obsidian (Volcanic Glass (SiO2 - Silicon Dioxide with impurities)) — Igneous

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Agate (Silicon dioxide (Chalcedony), SiO2) — gemstone

Agate

Silicon dioxide (Chalcedony), SiO2

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)

Pumice (Pumice (a highly vesicular amorphous silicate glass)) — igneous

Pumice

Pumice (a highly vesicular amorphous silicate glass)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Basalt (Extrusive igneous rock) — igneous

Basalt

Extrusive igneous rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Polished black stone, possibly basalt or black jasper (Basalt (fine-grained mafic rock) or microcrystalline quartz if jasper) — igneous

Polished black stone, possibly basalt or black jasper

Basalt (fine-grained mafic rock) or microcrystalline quartz if jasper

Likely vesicular volcanic rock (scoriaceous basalt) (Vesicular basalt/scoria; chiefly plagioclase, pyroxene, olivine, and volcanic glass) — igneous

Likely vesicular volcanic rock (scoriaceous basalt)

Vesicular basalt/scoria; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Quartz (White/Milky with Iron Staining) (Silicon Dioxide (SiO2)) — mineral

Quartz (White/Milky with Iron Staining)

Silicon Dioxide (SiO2)

Rounded river pebble, possibly iron-rich quartzite or basalt (Indeterminate from image; likely fine-grained basalt (mafic silicate rock) or ferruginous quartzite) — igneous

Rounded river pebble, possibly iron-rich quartzite or basalt

Indeterminate from image; likely fine-grained basalt (mafic silicate rock) or ferruginous quartzite

Weathered vesicular basalt (Basalt, primarily plagioclase feldspar, pyroxene, and possibly olivine) — igneous

Weathered vesicular basalt

Basalt, primarily plagioclase feldspar, pyroxene, and possibly olivine

Dark gray fine-grained stone, likely basalt or andesite (Basalt–andesite volcanic rock; commonly composed of plagioclase, pyroxene, and possibly olivine or magnetite) — igneous

Dark gray fine-grained stone, likely basalt or andesite

Basalt–andesite volcanic rock; commonly composed of plagioclase, pyroxene, and possibly olivine or magnetite

Probable weathered basalt or andesite (Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides) — igneous

Probable weathered basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Rhyolite or fine-grained volcanic rock (Rhyolite ( felsic volcanic rock; commonly quartz + alkali feldspar)) — igneous

Rhyolite or fine-grained volcanic rock

Rhyolite ( felsic volcanic rock; commonly quartz + alkali feldspar)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Weathered volcanic rock, likely andesite or basalt (Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals) — igneous

Weathered volcanic rock, likely andesite or basalt

Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals

Scoria (vesicular basalt) (Scoria; iron-rich vesicular basalt, primarily plagioclase, pyroxene, and olivine) — igneous

Scoria (vesicular basalt)

Scoria; iron-rich vesicular basalt, primarily plagioclase, pyroxene, and olivine

Basalt with olivine (Porphyritic Basalt) (Mafic Igneous Volcanic Rock (Extrusive Basalt)) — igneous

Basalt with olivine (Porphyritic Basalt)

Mafic Igneous Volcanic Rock (Extrusive Basalt)

Weathered volcanic rock, likely altered basalt (Basaltic rock, probably chlorite–epidote–iron-oxide altered basalt) — igneous

Weathered volcanic rock, likely altered basalt

Basaltic rock, probably chlorite–epidote–iron-oxide altered basalt

Weathered basalt or mafic volcanic rock (Basalt; typically plagioclase feldspar, clinopyroxene, and often olivine or iron oxides) — igneous

Weathered basalt or mafic volcanic rock

Basalt; typically plagioclase feldspar, clinopyroxene, and often olivine or iron oxides

Chalcedony (Agate/Carnelian precursor) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Basalt River Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt River Pebble

Aphanitic Mafic Igneous Rock

Basalt Pebble (Mafic Igneous Rock (Basalt)) — igneous

Basalt Pebble

Mafic Igneous Rock (Basalt)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Basalt (River Pebble) (Extrusive Mafic Igneous Rock) — igneous

Basalt (River Pebble)

Extrusive Mafic Igneous Rock

Weathered vesicular volcanic rock, likely scoria (Scoria (vesicular basalt), composed chiefly of plagioclase, pyroxene, and iron-rich glass) — igneous

Weathered vesicular volcanic rock, likely scoria

Scoria (vesicular basalt), composed chiefly of plagioclase, pyroxene, and iron-rich glass

Vesicular basalt (weathered basaltic cobble) (Basalt; primarily plagioclase, pyroxene, and olivine) — igneous

Vesicular basalt (weathered basaltic cobble)

Basalt; primarily plagioclase, pyroxene, and olivine

Dalmatian Jasper (Peralkaline Quartz-Feldspar Porphyritic Rock (Dalmatian Stone)) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyritic Rock (Dalmatian Stone)